Are you looking for https://docs.oracle.com/javase/tutorial/uiswing/events/propertychangelistener.html ?

Maybe you could describe in more detail, what you have already tried and where you want to listen for changed values?

Felix

Am 22.02.22 um 09:32 schrieb 张天赐:
When i use https://jmeter.apache.org/usermanual/jmeter_tutorial.html#testbean 
to extending JMeter. I want listen field value change. How can i do?

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